ms/blueprintsprocessor/modules/commons/rest-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/rest/service/BlueprintWebClientService.kt

   1 /*
   2  * Copyright © 2017-2019 AT&T, Bell Canada, Nordix Foundation
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  * SPDX-License-Identifier: Apache-2.0
  17  */
  18
  19 package org.onap.ccsdk.cds.blueprintsprocessor.rest.service
  20
  21 import org.apache.commons.io.IOUtils
  22 import org.apache.http.client.methods.*
  23 import org.apache.http.entity.StringEntity
  24 import org.apache.http.impl.client.CloseableHttpClient
  25 import org.apache.http.impl.client.HttpClients
  26 import org.apache.http.message.BasicHeader
  27 import org.onap.ccsdk.cds.blueprintsprocessor.rest.utils.WebClientUtils
  28 import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintProcessorException
  29 import org.springframework.http.HttpMethod
  30 import java.nio.charset.Charset
  31
  32 interface BlueprintWebClientService {
  33
  34     fun defaultHeaders(): Map<String, String>
  35
  36     fun host(uri: String): String
  37
  38     fun httpClient(): CloseableHttpClient {
  39         return HttpClients.custom()
  40             .addInterceptorFirst(WebClientUtils.logRequest())
  41             .addInterceptorLast(WebClientUtils.logResponse())
  42             .build()
  43     }
  44
  45     fun exchangeResource(methodType: String, path: String, request: String): String {
  46         return this.exchangeResource(methodType, path, request, defaultHeaders())
  47     }
  48
  49     fun exchangeResource(methodType: String, path: String, request: String, headers: Map<String, String>): String {
  50         val convertedHeaders: Array<BasicHeader> = convertToBasicHeaders(headers)
  51         return when (HttpMethod.resolve(methodType)) {
  52             HttpMethod.DELETE -> delete(path, convertedHeaders)
  53             HttpMethod.GET -> get(path, convertedHeaders)
  54             HttpMethod.POST -> post(path, request, convertedHeaders)
  55             HttpMethod.PUT -> put(path, request, convertedHeaders)
  56             HttpMethod.PATCH -> patch(path, request, convertedHeaders)
  57             else -> throw BluePrintProcessorException("Unsupported methodType($methodType)")
  58         }
  59     }
  60
  61     fun convertToBasicHeaders(headers: Map<String, String>): Array<BasicHeader> {
  62         val convertedHeaders = Array<BasicHeader>(headers.size){ BasicHeader("","") }
  63         var currentElement = 0
  64         for ((name, value) in headers) {
  65             convertedHeaders[currentElement++] = BasicHeader(name, value)
  66         }
  67         return convertedHeaders
  68     }
  69
  70     fun delete(path: String, headers: Array<BasicHeader>): String {
  71         val httpDelete = HttpDelete(host(path))
  72         httpDelete.setHeaders(headers)
  73         httpClient().execute(httpDelete).entity.content.use {
  74             return IOUtils.toString(it, Charset.defaultCharset())
  75         }
  76     }
  77
  78     fun get(path: String, headers: Array<BasicHeader>): String {
  79         val httpGet = HttpGet(host(path))
  80         httpGet.setHeaders(headers)
  81         httpClient().execute(httpGet).entity.content.use {
  82             return IOUtils.toString(it, Charset.defaultCharset())
  83         }
  84     }
  85
  86     fun post(path: String, request: String, headers: Array<BasicHeader>): String {
  87         val httpPost = HttpPost(host(path))
  88         val entity = StringEntity(request)
  89         httpPost.entity = entity
  90         httpPost.setHeaders(headers)
  91         httpClient().execute(httpPost).entity.content.use {
  92             return IOUtils.toString(it, Charset.defaultCharset())
  93         }
  94     }
  95
  96     fun put(path: String, request: String, headers: Array<BasicHeader>): String {
  97         val httpPut = HttpPut(host(path))
  98         val entity = StringEntity(request)
  99         httpPut.entity = entity
 100         httpPut.setHeaders(headers)
 101         httpClient().execute(httpPut).entity.content.use {
 102             return IOUtils.toString(it, Charset.defaultCharset())
 103         }
 104     }
 105
 106     fun patch(path: String, request: String, headers: Array<BasicHeader>): String {
 107         val httpPatch = HttpPatch(host(path))
 108         val entity = StringEntity(request)
 109         httpPatch.entity = entity
 110         httpPatch.setHeaders(headers)
 111         httpClient().execute(httpPatch).entity.content.use {
 112             return IOUtils.toString(it, Charset.defaultCharset())
 113         }
 114     }
 115 }